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NegLon - Display negative longitude values?

Description:
This attribute is a boolean value which controls how longitude values are normalized for display by astNorm.

If the NegLon attribute is zero, then normalized longitude values will be in the range zero to 2.pi. If NegLon is non-zero, then normalized longitude values will be in the range -pi to pi.

The default value depends on the current value of the SkyRefIs attribute, If SkyRefIs has a value of "Origin", then the default for NegLon is one, otherwise the default is zero.

Type:
Integer (boolean).
Class Applicability:
SkyFrame
All SkyFrames have this attribute.


next up previous 264
Next: Negated - Region negation flag
Up: AST Attribute Descriptions
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AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
24th May 2011
E-mail:ussc@star.rl.ac.uk

Copyright (C) 2009 Science \& Technology Facilities Council